[33.05] Radio Free-Free Emission from Young Stellar Objects

We use x-winds heated and ionized by the physical mechanisms
discussed in earlier communications by our group to model
the free-free emission at centimeter wavelengths of the jets
from young stellar objects (YSOs). With stellar parameters,
mass-loss rates, and x-ray luminosities characteristic of
Class 0 or Class I YSOs, we recover realistic spectral
indices and radio maps. In particular, the 3.6 cm flux in
models with mass loss rates ~ 10-6 M\odot/yr or
higher are comparable to existing observations of radio jets
at 0".1 resolution. Lower mass-loss rates characteristic of
Class II YSOs with revealed optical jets generally produce
radio jets that are too weak to be detected at current
sensitivity levels. We discuss the implications of these
comparisons for theoretical models of the YSO outflow
phenomenon.